WASHINGTON — The Supreme Court’s conservative majority appeared skeptical Friday of the Biden administration’s authority to impose a vaccine-or-testing requirement on the nation’s large employers. The court also was hearing arguments on a separate vaccine mandate for most health care workers.

NEW ORLEANS — Louisiana’s governor on Wednesday posthumously pardoned Homer Plessy, the Black man whose arrest for refusing to leave a whites-only railroad car in 1892 led to the Supreme Court ruling that cemented “separate but equal” into U.S. law for half a century.